EP4272738A2 - Anticorps anti-cd38 pour le traitement de la leucémie lymphoblastique aiguë - Google Patents

Anticorps anti-cd38 pour le traitement de la leucémie lymphoblastique aiguë Download PDF

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EP4272738A2
EP4272738A2 EP23192698.1A EP23192698A EP4272738A2 EP 4272738 A2 EP4272738 A2 EP 4272738A2 EP 23192698 A EP23192698 A EP 23192698A EP 4272738 A2 EP4272738 A2 EP 4272738A2
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antibody
seq
use according
cells
antibodies
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EP4272738A3 (fr
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Parul Doshi
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Janssen Biotech Inc
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/2896—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against molecules with a "CD"-designation, not provided for elsewhere
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
    • A61K31/47—Quinolines; Isoquinolines
    • A61K31/475—Quinolines; Isoquinolines having an indole ring, e.g. yohimbine, reserpine, strychnine, vinblastine
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K39/395—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K39/395—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum
    • A61K39/39533—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum against materials from animals
    • A61K39/39558—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum against materials from animals against tumor tissues, cells, antigens
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents
    • A61P35/02—Antineoplastic agents specific for leukemia
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/55—Medicinal preparations containing antigens or antibodies characterised by the host/recipient, e.g. newborn with maternal antibodies
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2300/00—Mixtures or combinations of active ingredients, wherein at least one active ingredient is fully defined in groups A61K31/00 - A61K41/00
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/30—Immunoglobulins specific features characterized by aspects of specificity or valency
    • C07K2317/34—Identification of a linear epitope shorter than 20 amino acid residues or of a conformational epitope defined by amino acid residues
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
    • C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
    • C07K2317/73—Inducing cell death, e.g. apoptosis, necrosis or inhibition of cell proliferation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
    • C07K2317/73—Inducing cell death, e.g. apoptosis, necrosis or inhibition of cell proliferation
    • C07K2317/732—Antibody-dependent cellular cytotoxicity [ADCC]
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
    • C07K2317/73—Inducing cell death, e.g. apoptosis, necrosis or inhibition of cell proliferation
    • C07K2317/734—Complement-dependent cytotoxicity [CDC]

Definitions

  • the present invention relates to methods of treatment of acute lymphoblastic leukemia with anti-CD38 antibodies.
  • CD38 is a multifunctional protein having function in receptor-mediated adhesion and signaling, as well as mediating calcium mobilization via its ecto-enzymatic activity catalyzing formation of cyclic ADP-ribose (cADPR) and ADPR.
  • CD38 mediates cytokine secretion and activation and proliferation of lymphocytes ( Funaro et al., J Immunol 145:2390-6, 1990 ; Terhorst et al., Cell 771-80, 1981 ; Guse et al., Nature 398:70-3, 1999 ).
  • CD38 via its NAD glycohydrolase activity, also regulates extracellular NAD + levels, which have been implicated in modulating the regulatory T-cell compartment (Adriouch et al., 14: 1284-92, 2012; Chiarugi et al., Nature Reviews 12:741-52, 2012 ).
  • CD38 signaling occurs via cross-talk with antigen-receptor complexes on T and B cells or other types of receptor complexes, e.g ., MHC molecules, involving CD38 in several cellular responses, but also in switching and secretion of IgG1.
  • CD38 is a type II transmembrane glycoprotein expressed on hemopoietic cells such as medullary thymocytes, activated T- and B-cells, resting NK cells and monocytes, lymph node germinal center lymphoblasts, plasma B cells, intrafollicular cells and dendritic cells. A portion of normal bone marrow cells, particular precursor cells as well as umbilical cord cells are CD38-positive. In addition to lymphoid precursor cells, CD38 is expressed on erythrocytes and on platelets, and expression is also found in some solid tissues such as gut, brain, prostate, bone, and pancreas. Mature resting T- and B-cells express limited to no surface CD38.
  • CD38 is also expressed in a variety of malignant hematological diseases, including multiple myeloma, leukemias and lymphomas, such as B-cell chronic lymphocytic leukemia, T- and B-cell acute lymphocytic leukemia, Waldenstrom macroglobulinemia, primary systemic amyloidosis, mantle-cell lymphoma, pro-lymphocytic/myelocytic leukemia, acute myeloid leukemia, chronic myeloid leukemia, follicular lymphoma, Burkitt's lymphoma, large granular lymphocytic (LGL) leukemia, NK-cell leukemia and plasma-cell leukemia.
  • multiple myeloma such as B-cell chronic lymphocytic leukemia, T- and B-cell acute lymphocytic leukemia, Waldenstrom macroglobulinemia, primary systemic amyloidosis, mantle-cell lymphoma, pro-lymphoc
  • CD38 has been described on epithelial/endothelial cells of different origin, including glandular epithelium in prostate, islet cells in pancreas, ductal epithelium in glands, including parotid gland, bronchial epithelial cells, cells in testis and ovary and tumor epithelium in colorectal adenocarcinoma.
  • CD38 expression could be involved, include, e.g., broncho-epithelial carcinomas of the lung, breast cancer (evolving from malignant proliferation of epithelial lining in ducts and lobules of the breast), pancreatic tumors, evolving from the ⁇ -cells (insulinomas), tumors evolving from epithelium in the gut (e.g. adenocarcinoma and squamous cell carcinoma), carcinoma in the prostate gland, and seminomas in testis and ovarian cancers.
  • neuroblastomas express CD38.
  • Acute lymphoblastic leukemia is characterized by impaired early lymphoid development and is classified as either B-cell or T-cell ALL. Buriktt's lymphoma ("Mature B cell lymphoma”) is also classified as ALL. Incidence of ALL is about 6000 new cases per year, or approximately 1 in 50,000. Both genetic and environmental factors contribute to ALL, with several chromosomal rearrangement and submicroscopic genetic alterations identified ( Inaba et al., Lancet 381:1943-55, 2013 ). Overall response rates to therapy in children having ALL is about 80%, and about 45%-60% in adults with ALL. Unfortunately, prognosis in relapsed ALL is poor.
  • One embodiment of the invention is a method of treating a subject having acute lymphoblastic leukemia (ALL), comprising administering to a patient in need thereof an anti-CD38 antibody that competes for binding to CD38 with an antibody comprising a heavy chain variable region (VH) of SEQ ID NO: 4 and a light chain variable region (VL) of SEQ ID NO: 5, wherein the anti-CD38 antibody induces in vitro killing of ALL cells by antibody-dependent cell-mediated cytotoxicity (ADCC), antibody-dependent cellular phagocytosis (ADCP), complement dependent cytotoxicity (CDC), apoptosis, or in vitro modulation of CD38 enzymatic activity.
  • ADCC antibody-dependent cell-mediated cytotoxicity
  • ADCP antibody-dependent cellular phagocytosis
  • CDC complement dependent cytotoxicity
  • apoptosis or in vitro modulation of CD38 enzymatic activity.
  • CD38 refers to the human CD38 protein (synonyms: ADP-ribosyl cyclase 1, cADPr hydrolase 1, cyclic ADP-ribose hydrolase 1). Human CD38 has an amino acid sequence shown in SEQ ID NO: 1
  • antibodies as used herein is meant in a broad sense and includes immunoglobulin molecules including polyclonal antibodies, monoclonal antibodies including murine, human, human-adapted, humanized and chimeric monoclonal antibodies, antibody fragments, bispecific or multispecific antibodies, dimeric, tetrameric or multimeric antibodies, and single chain antibodies.
  • Immunoglobulins can be assigned to five major classes, namely IgA, IgD, IgE, IgG and IgM, depending on the heavy chain constant domain amino acid sequence.
  • IgA and IgG are further sub-classified as the isotypes IgA 1 , IgA 2 , IgG 1 , IgG 2 , IgG 3 and IgG 4 .
  • Antibody light chains of any vertebrate species can be assigned to one of two clearly distinct types, namely kappa ( ⁇ ) and lambda ( ⁇ ), based on the amino acid sequences of their constant domains.
  • antibody fragments refers to a portion of an immunoglobulin molecule that retains the heavy chain and/or the light chain antigen binding site, such as heavy chain complementarity determining regions (HCDR) 1, 2 and 3, light chain complementarity determining regions (LCDR) 1, 2 and 3, a heavy chain variable region (VH), or a light chain variable region (VL).
  • HCDR heavy chain complementarity determining regions
  • LCDR light chain complementarity determining regions
  • VH heavy chain variable region
  • VL light chain variable region
  • Antibody fragments include a Fab fragment, a monovalent fragment consisting of the VL, VH, CL and CHI domains; a F(ab) 2 fragment, a bivalent fragment comprising two Fab fragments linked by a disulfide bridge at the hinge region; a Fd fragment consisting of the VH and CHI domains; a Fv fragment consisting of the VL and VH domains of a single arm of an antibody; a domain antibody (dAb) fragment ( Ward et al (1989) Nature 341:544- 546 ), which consists of a VH domain.
  • dAb domain antibody
  • VH and VL domains can be engineered and linked together via a synthetic linker to form various types of single chain antibody designs where the VH/VL domains pair intramolecularly, or intermolecularly in those cases when the VH and VL domains are expressed by separate single chain antibody constructs, to form a monovalent antigen binding site, such as single chain Fv (scFv) or diabody; described for example in PCT Intl. Publ. Nos. WO1998/44001 , WO1988/01649 , WO1994/13804 , and WO1992/01047 .
  • scFv single chain Fv
  • isolated antibody refers to an antibody or antibody fragment that is substantially free of other antibodies having different antigenic specificities (e.g., an isolated antibody specifically binding CD38 is substantially free of antibodies that specifically bind antigens other than human CD38).
  • An isolated antibody that specifically binds CD38 can have cross-reactivity to other antigens, such as orthologs of human CD38, such as Macaca fascicularis (cynomolgus) CD38.
  • an isolated antibody may be substantially free of other cellular material and/or chemicals.
  • An antibody variable region consists of a "framework" region interrupted by three "antigen binding sites".
  • the antigen binding sites are defined using various terms such as Complementarity Determining Regions (CDRs), three in the VH (HCDR1, HCDR2, HCDR3), and three in the VL (LCDR1, LCDR2, LCDR3), are based on sequence variability ( Wu and Kabat J Exp Med 132:211-50, 1970 ; Kabat et al Sequences of Proteins of Immunological Interest, 5th Ed.
  • CDRs Complementarity Determining Regions
  • HVR HVR
  • HV HV
  • H1, H2, H3 three in the VH (H1, H2, H3) and three in the VL (L1, L2, L3), refer to the regions of an antibody variable domains which are hypervariable in structure as defined by Chothia and Lesk ( Chothia and Lesk Mol Biol 196:901-17, 1987 ).
  • Other terms include "IMGT-CDRs” ( Lefranc et al., Dev Comparat Immunol 27:55-77, 2003 ) and “ Specificity Determining Residue Usage” (SDRU) (Almagro, Mol Recognit 17:132-43, 2004 ).
  • IMGT International ImMunoGeneTics
  • Chothia residues as used herein are the antibody VL and VH residues numbered according to Al-Lazikani ( Al-Lazikani et al., J Mol Biol 273:927-48, 1997 ).
  • Framework or “framework sequences” are the remaining sequences of a variable region other than those defined to be antigen binding sites. Because the antigen binding sites can be defined by various terms as described above, the exact amino acid sequence of a framework depends on how the antigen-binding site was defined.
  • Humanized antibody refers to an antibody in which the antigen binding sites are derived from non-human species and the variable region frameworks are derived from human immunoglobulin sequences. Humanized antibodies may include substitutions in the framework regions so that the framework may not be an exact copy of expressed human immunoglobulin or germline gene sequences.
  • Human-adapted antibodies or “human framework adapted (HFA)” antibodies refers to humanized antibodies adapted according to methods described in U.S. Pat. Publ. No. US2009/0118127 .
  • Human-adapted antibodies are humanized by selecting the acceptor human frameworks based on the maximum CDR and FR similarities, length compatibilities and sequence similarities of CDR1 and CDR2 loops and a portion of light chain CDR3 loops.
  • Human antibody refers to an antibody having heavy and light chain variable regions in which both the framework and the antigen binding sites are derived from sequences of human origin. If the antibody contains a constant region, the constant region also is derived from sequences of human origin.
  • a human antibody comprises heavy or light chain variable regions that are "derived from” sequences of human origin wherein the variable regions of the antibody are obtained from a system that uses human germline immunoglobulin or rearranged immunoglobulin genes.
  • Such systems include human immunoglobulin gene libraries displayed on phage, and transgenic non-human animals such as mice carrying human immunoglobulin loci as described herein.
  • a "human antibody” may contain amino acid differences when compared to the human germline or rearranged immunoglobulin sequences due to for example naturally occurring somatic mutations or intentional introduction of substitutions in the framework or antigen binding sites.
  • a human antibody is at least about 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% identical in amino acid sequence to an amino acid sequence encoded by a human germline or rearranged immunoglobulin gene.
  • human antibody may contain consensus framework sequences derived from human framework sequence analyses, for example as described in Knappik et al., J Mol Biol 296:57-86, 2000 ), or synthetic HCDR3 incorporated into human immunoglobulin gene libraries displayed on phage, for example as described in Shi et al., J Mol Biol 397:385-96, 2010 and Intl. Pat. Publ. No. WO2009/085462 ). Antibodies in which antigen binding sites are derived from a non-human species are not included in the definition of human antibody.
  • Isolated humanized antibodies may be synthetic.
  • Human antibodies, while derived from human immunoglobulin sequences, may be generated using systems such as phage display incorporating synthetic CDRs and/or synthetic frameworks, or can be subjected to in vitro mutagenesis to improve antibody properties, resulting in antibodies that do not naturally exist within the human antibody germline repertoire in vivo.
  • recombinant antibody includes all antibodies that are prepared, expressed, created or isolated by recombinant means, such as antibodies isolated from an animal (e.g., a mouse) that is transgenic or transchromosomal for human immunoglobulin genes or a hybridoma prepared therefrom (described further below), antibodies isolated from a host cell transformed to express the antibody, antibodies isolated from a recombinant, combinatorial antibody library, and antibodies prepared, expressed, created or isolated by any other means that involve splicing of human immunoglobulin gene sequences to other DNA sequences, or antibodies that are generated in vitro using Fab arm exchange such as bispecific antibodies.
  • monoclonal antibody refers to a preparation of antibody molecules of single molecular composition.
  • a monoclonal antibody composition displays a single binding specificity and affinity for a particular epitope, or in a case of a bispecific monoclonal antibody, a dual binding specificity to two distinct epitopes.
  • epitope means a portion of an antigen to which an antibody specifically binds.
  • Epitopes usually consist of chemically active (such as polar, non-polar or hydrophobic) surface groupings of moieties such as amino acids or polysaccharide side chains and can have specific three-dimensional structural characteristics, as well as specific charge characteristics.
  • An epitope can be composed of contiguous and/or discontiguous amino acids that form a conformational spatial unit. For a discontiguous epitope, amino acids from differing portions of the linear sequence of the antigen come in close proximity in 3-dimensional space through the folding of the protein molecule.
  • Variant refers to a polypeptide or a polynucleotide that differs from a reference polypeptide or a reference polynucleotide by one or more modifications for example, substitutions, insertions or deletions.
  • combination with means that two or more therapeutics can be administered to a subject together in a mixture, concurrently as single agents or sequentially as single agents in any order.
  • treat refers to both therapeutic treatment and prophylactic or preventative measures, wherein the object is to prevent or slow down (lessen) an undesired physiological change or disorder, such as the development or spread of tumor or tumor cells.
  • beneficial or desired clinical results include alleviation of symptoms, diminishment of extent of disease, stabilized (i.e., not worsening) state of disease, delay or slowing of disease progression, amelioration or palliation of the disease state, and remission (whether partial or total), whether detectable or undetectable.
  • Treatment can also mean prolonging survival as compared to expected survival if a subject was not receiving treatment.
  • Those in need of treatment include those already with the condition or disorder as well as those prone to have the condition or disorder or those in which the condition or disorder is to be prevented.
  • “Inhibits growth” refers to a measurable decrease in the cell growth in vitro or in vivo when contacted with a therapeutic or a combination of therapeutics or drugs when compared to the growth of the same cells grown in appropriate control conditions well known to the skilled in the art. Inhibition of growth of a cell in vitro or in vivo may be at least about 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 99%, or 100%.
  • Inhibition of cell growth can occur by a variety of mechanisms, for example by antibody-dependent cell-mediated cytotoxicity (ADCC), antibody-dependent cellular phagocytosis (ADCP), complement dependent cytotoxicity (CDC), apoptosis, necrosis, or by inhibition of cell proliferation.
  • ADCC antibody-dependent cell-mediated cytotoxicity
  • ADCP antibody-dependent cellular phagocytosis
  • CDC complement dependent cytotoxicity
  • apoptosis necrosis
  • necrosis or by inhibition of cell proliferation.
  • a “therapeutically effective amount” refers to an amount effective, at dosages and for periods of time necessary, to achieve a desired therapeutic result.
  • a therapeutically effective amount may vary according to factors such as the disease state, age, sex, and weight of the individual, and the ability of a therapeutic or a combination of therapeutics to elicit a desired response in the individual.
  • Exemplary indicators of an effective therapeutic or combination of therapeutics include, for example, improved well-being of the patient, reduction of a tumor burden, arrested or slowed growth of a tumor, and/or absence of metastasis of cancer cells to other locations in the body.
  • One embodiment of the invention described herein, and in some embodiments of each and every one of the numbered embodiments listed below, is a method of treating a subject having acute lymphoblastic leukemia (ALL), comprising administering to a patient in need thereof an anti-CD38 antibody that competes for binding to CD38 with an antibody comprising a heavy chain variable region (VH) of SEQ ID NO: 4 and a light chain variable region (VL) of SEQ ID NO: 5, wherein the anti-CD38 antibody induces in vitro killing of ALL cells by antibody-dependent cell-mediated cytotoxicity (ADCC), antibody-dependent cellular phagocytosis (ADCP), complement dependent cytotoxicity (CDC), apoptosis, or in vitro modulation of CD38 enzymatic activity.
  • ADCC antibody-dependent cell-mediated cytotoxicity
  • ADCP antibody-dependent cellular phagocytosis
  • CDC complement dependent cytotoxicity
  • Another embodiment of the invention described herein, and in some embodiments of each and every one of the numbered embodiments listed below, is a method of treating a subject having acute lymphoblastic leukemia (ALL), comprising administering to a patient in need thereof an anti-CD38 antibody that binds to the region SKRNIQFSCKNIYR (SEQ ID NO: 2) and the region EKVQTLEAWVIHGG (SEQ ID NO: 3) of human CD38 (SEQ ID NO: 1), wherein the anti-CD38 antibody induces in vitro killing of ALL cells by antibody-dependent cell-mediated cytotoxicity (ADCC), antibody-dependent cellular phagocytosis (ADCP), complement dependent cytotoxicity (CDC), apoptosis, or in vitro modulation of CD38 enzymatic activity.
  • ADCC antibody-dependent cell-mediated cytotoxicity
  • ADCP antibody-dependent cellular phagocytosis
  • CDC complement dependent cytotoxicity
  • the epitope of the antibody includes some or all of the residues having the sequences shown in SEQ ID NO: 2 or SEQ ID NO: 3.
  • the antibody epitope comprises at least one amino acid in the region SKRNIQFSCKNIYR (SEQ ID NO: 2) and at least one amino acid in the region EKVQTLEAWVIHGG (SEQ ID NO: 3) of human CD38 (SEQ ID NO: 1).
  • the antibody epitope comprises at least two amino acids in the region SKRNIQFSCKNIYR (SEQ ID NO: 2) and at least two amino acids in the region EKVQTLEAWVIHGG (SEQ ID NO: 3) of human CD38 (SEQ ID NO: 1). In some embodiments disclosed herein, including in the numbered embodiments listed below, the antibody epitope comprises at least three amino acids in the region SKRNIQFSCKNIYR (SEQ ID NO: 2) and at least three amino acids in the region EKVQTLEAWVIHGG (SEQ ID NO: 3) of human CD38 (SEQ ID NO: 1).
  • the anti-CD38 antibody binds to an epitope comprising at least KRN in the region SKRNIQFSCKNIYR (SEQ ID NO: 2) and comprising at least VQLT (SEQ ID NO: 14) in the region EKVQTLEAWVIHGG (SEQ ID NO: 3) of human CD38 (SEQ ID NO: 1).
  • An exemplary antibody that binds to the region SKRNIQFSCKNIYR (SEQ ID NO: 2) and the region EKVQTLEAWVIHGG (SEQ ID NO: 3) of human CD38 (SEQ ID NO: 1) or minimally to residues KRN and VQLT (SEQ ID NO: 14) as shown above is daratumumab (see Intl. Pat. Publ. No. WO2006/0998647 ).
  • Daratumumab comprises VH and a VL amino acid sequences shown in SEQ ID NO: 4 and 5, respectively, heavy chain CDRs HCDR1, HCDR2 and HCDR3 of SEQ ID NOs: 6, 7 and 8, and light chain CDRs LCDR1, LCDR2 and LCDR3 of SEQ ID NOs: 9, 10 and 11, respectively, and is of IgG1/ ⁇ subtype.
  • Daratumumab heavy chain amino acid sequence is shown in SEQ ID NO: 12 and light chain amino acid sequence shown in SEQ ID NO: 13.
  • Antibodies can be evaluated for their competition with daratumumab having VH of SEQ ID NO: 4 and VL of SEQ ID NO: 5 for binding to CD38 using well known in vitro methods.
  • CHO cells recombinantly expressing CD38 may be incubated with unlabeled daratumumab for 15 min at 4°C, followed by incubation with an excess of fluorescently labeled test antibody for 45 min at 4°C. After washing in PBS/BSA, fluorescence may be measured by flow cytometry using standard methods.
  • extracellular portion of human CD38 may be coated on the surface of an ELISA plate.
  • test antibody competes with daratumumab when daratumumab inhibits binding of the test antibody, or the test antibody inhibits binding of daratumumab by 20%, 30%, 40%, 50%, 60%, 70%, 80%, 85%, 90% , 95% or 100%.
  • the epitope of the test antibody can further be defined for example by peptide mapping or hydrogen/deuterium protection assays using known methods, or by crystal structure determination.
  • Antibodies binding to the same region on CD38 as daratumumab can be generated for example by immunizing mice with peptides having the amino acid sequences shown in SEQ ID NOs: 2 and 3 using standard methods and as described herein. Antibodies can be further evaluated for example by assaying competition between daratumumab and a test antibody for binding to CD38 using well known in vitro methods and as described above.
  • the Fc portion of the antibody may mediate antibody effector functions such as antibody-dependent cell-mediated cytotoxicity (ADCC), antibody-dependent cellular phagocytosis (ADCP) or complement dependent cytotoxicity (CDC).
  • ADCC antibody-dependent cell-mediated cytotoxicity
  • ADCP antibody-dependent cellular phagocytosis
  • CDC complement dependent cytotoxicity
  • Such function may be mediated by binding of an Fc effector domain(s) to an Fc receptor on an immune cell with phagocytic or lytic activity or by binding of an Fc effector domain(s) to components of the complement system.
  • the effect(s) mediated by the Fc-binding cells or complement components result in inhibition and/or depletion of target cells, for example CD38-expressing cells.
  • Human IgG isotypes IgG1, IgG2, IgG3 and IgG4 exhibit differential capacity for effector functions.
  • ADCC may be mediated by IgG1 and IgG3
  • ADCP may be mediated by
  • the anti-CD38 antibody is of IgG1, IgG2, IgG3 or IgG4 isotype.
  • the anti-CD38 induces in vitro killing of ALL cells that express CD38 by ADCC.
  • the anti-CD38 induces in vitro killing of ALL cells that express CD38 by CDC.
  • the anti-CD38 antibody induces in vitro killing of ALL cells that express CD38 by ADCP.
  • the anti-CD38 antibody induces in vitro killing of ALL cells that express CD38 by apoptosis.
  • the anti-CD38 antibody induces in vitro killing of ALL cells that express CD38 by ADCC and CDC
  • the anti-CD38 antibody of the invention will induce in vivo killing of ALL cells that express CD38 by ADCC, CDC, ADCP, apoptosis or in vivo modulation of CD38 enzymatic activity.
  • Antibody-dependent cellular cytotoxicity is a mechanism for inducing cell death that depends upon the interaction of antibody-coated target cells with effector cells possessing lytic activity, such as natural killer cells, monocytes, macrophages and neutrophils via Fc gamma receptors (FcyR) expressed on effector cells.
  • effector cells possessing lytic activity, such as natural killer cells, monocytes, macrophages and neutrophils via Fc gamma receptors (FcyR) expressed on effector cells.
  • FcyR Fc gamma receptors
  • NK cells express FcyRIIIa
  • monocytes express FcyRI, FcyRII and FcvRIIIa.
  • Death of the antibody-coated target cell such as CD38-expressing cells, occurs as a result of effector cell activity through the secretion of membrane pore-forming proteins and proteases.
  • the antibody may be added to CD38-expressing cells in combination with immune effector cells, which may be activated by the antigen antibody complexes resulting in cytolysis of the target cell. Cytolysis is generally detected by the release of label (e.g. radioactive substrates, fluorescent dyes or natural intracellular proteins) from the lysed cells.
  • label e.g. radioactive substrates, fluorescent dyes or natural intracellular proteins
  • exemplary effector cells for such assays include peripheral blood mononuclear cells (PBMC) and NK cells.
  • PBMC peripheral blood mononuclear cells
  • target cells include Daudi cells (ATCC ® CCL-213 TM ) or B cell leukemia or lymphoma tumor cells expressing CD38.
  • target cells are labeled with 20 ⁇ Ci of 51 Cr for 2 hours and washed extensively.
  • Cell concentration of the target cells can be adjusted to 1 ⁇ 10 6 cells/ml, and anti-CD38 antibodies at various concentrations are added.
  • Assays are started by adding Daudi cells at an effector:target cell ratio of 40:1. After incubation for 3 hr at 37°C assays are stopped by centrifugation, and 51 Cr release from lysed cells are measured in a scintillation counter. Percentage of cellular cytotoxicity may be calculated as % maximal lysis which may be induced by adding 3% perchloric acid to target cells.
  • Anti-CD38 antibodies used in the methods of the invention may induce ADCC by about 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or 100% of control (cell lysis induced by 3% perchloric acid).
  • ADCP Antibody-dependent cellular phagocytosis
  • phagocytic cells such as macrophages or dendritic cells.
  • ADCP may be evaluated by using monocyte-derived macrophages as effector cells and Daudi cells (ATCC ® CCL-213 TM ) or B cell leukemia or lymphoma tumor cells expressing CD38 as target cells engineered to express GFP or other labeled molecule.
  • Effctor:target cell ratio may be for example 4: 1. Effector cells may be incubated with target cells for 4 hours with or without anti-CD38 antibody. After incubation, cells may be detached using accutase.
  • Macrophages can be identified with anti-CD1 1b and anti-CD14 antibodies coupled to a fluorescent label, and percent phagocytosis can be determined based on % GFP fluorescent in the CD1 1 + CD14 + macrophages using standard methods.
  • Anti-CD38 antibodies used in the methods of the invention may induce ADCP by about 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or 100% .
  • “Complement-dependent cytotoxicity”, or “CDC” refers to a mechanism for inducing cell death in which an Fc effector domain of a target-bound antibody binds and activates complement component C1q which in turn activates the complement cascade leading to target cell death. Activation of complement may also result in deposition of complement components on the target cell surface that facilitate ADCC by binding complement receptors (e.g., CR3) on leukocytes.
  • complement receptors e.g., CR3
  • CDC of CD38-expressing cells can be measured for example by plating Daudi cells at 1 ⁇ 10 5 cells/well (50 ⁇ l/well) in RPMI-B (RPMI supplemented with 1% BSA), adding 50 ⁇ l anti-CD38 antibodies to the wells at final concentration between 0-100 ⁇ g/ml, incubating the reaction for 15 min at room temperature, adding 11 ⁇ l of pooled human serum to the wells, and incubation the reaction for 45 min at 37° C. Percentage (%) lysed cells may be detected as % propidium iodide stained cells in FACS assay using standard methods.
  • Anti-CD38 antibodies used in the methods of the invention may induce CDC by about 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or 100% .
  • the ability of monoclonal antibodies to induce ADCC can be enhanced by engineering their oligosaccharide component.
  • Human IgG1 or IgG3 are N-glycosylated at Asn297 with the majority of the glycans in the well-known biantennary G0, G0F, G1, G1F, G2 or G2F forms.
  • Antibodies produced by non-engineered CHO cells typically have a glycan fucose content of about at least 85%. The removal of the core fucose from the biantennary complex-type oligosaccharides attached to the Fc regions enhances the ADCC of antibodies via improved FcyRIIIa binding without altering antigen binding or CDC activity.
  • Such mAbs can be achieved using different methods reported to lead to the successful expression of relatively high defucosylated antibodies bearing the biantennary complex-type of Fc oligosaccharides such as control of culture osmolality ( Konno et al., Cytotechnology 64:249-65, 2012 ), application of a variant CHO line Lec13 as the host cell line ( Shields et al., J Biol Chem 277:26733-26740, 2002 ), application of a variant CHO line EB66 as the host cell line ( Olivier et al., MAbs ;2(4), 2010 ; Epub ahead of print; PMID:20562582), application of a rat hybridoma cell line YB2/0 as the host cell line ( Shinkawa et al., J Biol Chem 278:3466-3473, 2003 ), introduction of small interfering RNA specifically against the ⁇ 1,6-fucosyltrasferase (FUT8) gene
  • ADCC elicited by anti-CD38 antibodies used in the methods of the invention may also be enhanced by certain substitutions in the antibody Fc.
  • Exemplary substitutions are for example substitutions at amino acid positions 256, 290, 298, 312, 356, 330, 333, 334, 360, 378 or 430 (residue numbering according to the EU index) as described in U.S. Pat. No. 6,737,056 .
  • the anti-CD38 antibodies comprise a substitution in the antibody Fc.
  • the anti-CD38 antibodies comprise a substitution in the antibody Fc at amino acid positions 256, 290, 298, 312, 356, 330, 333, 334, 360, 378 or 430 (residue numbering according to the EU index).
  • the anti-CD38 antibody has a biantennary glycan structure with fucose content of about between 0% to about 15%, for example 15%, 14%, 13%, 12%, 11% 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1% or 0%.
  • the anti-CD38 antibody has a biantennary glycan structure with fucose content of about 50%, 40%, 45%, 40%, 35%, 30%, 25%, 20%, 15%, 14%, 13%, 12%, 11% 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1% or 0%
  • “Fucose content” means the amount of the fucose monosaccharide within the sugar chain at Asn297.
  • the relative amount of fucose is the percentage of fucose-containing structures related to all glycostructures. These may be characterized and quantified by multiple methods, for example: 1) using MALDI-TOF of N-glycosidase F treated sample (e.g. complex, hybrid and oligo- and high-mannose structures) as described in Intl. Pat. Publ. No.
  • WO2008/077546 2) by enzymatic release of the Asn297 glycans with subsequent derivatization and detection/ quantitation by HPLC (UPLC) with fluorescence detection and/or HPLC-MS (UPLC-MS); 3) intact protein analysis of the native or reduced mAb, with or without treatment of the Asn297 glycans with Endo S or other enzyme that cleaves between the first and the second GlcNAc monosaccharides, leaving the fucose attached to the first GlcNAc; 4) digestion of the mAb to constituent peptides by enzymatic digestion (e.g., trypsin or endopeptidase Lys-C), and subsequent separation, detection and quantitation by HPLC-MS (UPLC-MS) or 5) separation of the mAb oligosaccharides from the mAb protein by specific enzymatic deglycosylation with PNGase F at Asn 297.
  • UPLC UPLC
  • the oligosaccharides released can be labeled with a fluorophore, separated and identified by various complementary techniques which allow: fine characterization of the glycan structures by matrix-assisted laser desorption ionization (MALDI) mass spectrometry by comparison of the experimental masses with the theoretical masses, determination of the degree of sialylation by ion exchange HPLC (GlycoSep C), separation and quantification of the oligosacharride forms according to hydrophilicity criteria by normal-phase HPLC (GlycoSep N), and separation and quantification of the oligosaccharides by high performance capillary electrophoresis-laser induced fluorescence (HPCE-LIF).
  • MALDI matrix-assisted laser desorption ionization
  • Low fucose or “low fucose content” as used in the application refers to antibodies with fucose content of about 0% - 15%.
  • Normal fucose or 'normal fucose content refers to antibodies with fucose content of about over 50%, typically about over 60%, 70%, 80% or over 85%.
  • the anti-CD38 antibodies used in the methods described herein, and in some embodiments of each and every one of the numbered embodiments listed below, may induce in vitro killing of ALL cells by apoptosis.
  • Methods for evaluating apoptosis are well known, and include for example annexin IV staining using standard methods.
  • the anti-CD38 antibodies used in the methods of the invention may induce apoptosis in about 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or 100% of cells.
  • CD38 is a multifunctional ectoenzme with ADP-ribosyl cyclase 1 activity catalyzing the formation of cyclic ADP-ribose (cADPR) and ADPR from NAD + , and also functions to hydrolyze NAD + and cADPR to ADPR.
  • cADPR cyclic ADP-ribose
  • CD38 also catalyzes the exchange of the nicotinamide group of NADP + with nicotinic acid under acidic conditions, to yield NAADP + (nicotinic acid-adenine dinucleotide phosphate).
  • Modulation of the enzymatic activity of human CD38 with anti-CD38 antibodies used in the methods of the invention may be measured in an assay described in Graeff et al., J. Biol. Chem. 269, 30260-30267 (1994 ).
  • substrate NGD + may be incubated with CD38, and the modulation of the production of cyclic GDP-ribose (cGDPR) may be monitored spectrophotometrically at excitation at 340 nM and emission at 410 nM at different time points after addition of the antibody at various concentrations.
  • Inhibition of the synthesis of cADPR can be determined according to the HPLC method described in Munshi et al., J. Biol. Chem. 275, 21566-21571 (2000 ).
  • anti-CD38 antibodies used in the methods of the invention described herein, and in some embodiments of each and every one of the numbered embodiments listed below, may inhibit CD38 enzymatic activity by at least about 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or 100% .
  • the anti-CD38 antibody comprises the heavy chain complementarity determining regions (HCDR) 1 (HCDR1), 2 (HCDR2) and 3 (HCDR3) sequences of SEQ ID NOs: 6, 7 and 8, respectively.
  • the anti-CD38 antibody comprises the light chain complementarity determining regions (LCDR) 1 (LCDR1), 2 (LCDR2) and 3 (LCDR3) sequences of SEQ ID NOs: 9, 10 and 11, respectively.
  • the anti-CD38 antibody comprises the heavy chain variable region (VH) of SEQ ID NO: 4 and the light chain variable region (VL) of SEQ ID NO: 5.
  • the anti-CD38 antibody comprises a heavy chain of SEQ ID NO: 12 and a light chain of SEQ ID NO: 13.
  • the anti-CD38 antibody comprises a heavy chain comprising an amino acid sequence that is 95%, 96%, 97%, 98% or 99% identical to that of SEQ ID NO: 12 and a light chain comprising an amino acid sequence that is 95%, 96%, 97%, 98% or 99% identical to that of SEQ ID NO: 13.
  • Antibodies that are substantially identical to the antibody comprising the heavy chain of SEQ ID NO: 12 and the light chain of SEQ ID NO: 13 may be used in the methods of the invention.
  • the term "substantially identical" as used herein means that the two antibody heavy chain or light chain amino acid sequences being compared are identical or have "insubstantial differences". Insubstantial differences are substitutions of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15 amino acids in an antibody heavy chain or light chain that do not adversely affect antibody properties. Percent identity can be determined for example by pairwise alignment using the default settings of the AlignX module of Vector NTI v.9.0.0 (Invitrogen, Carlsbad, CA).
  • the protein sequences of the present invention can be used as a query sequence to perform a search against public or patent databases to, for example, identify related sequences.
  • Exemplary programs used to perform such searches are the XBLAST or BLASTP programs (http_//www_ncbi_nlm/nih_gov), or the GenomeQuest TM (GenomeQuest, Westborough, MA) suite using the default settings.
  • Exemplary substitutions that can be made to the anti-CD38 antibodies used in the methods of the invention are for example conservative substitutions with an amino acid having similar charge, hydrophobic, or stereochemical characteristics. Conservative substitutions may also be made to improve antibody properties, for example stability or affinity, or to improve antibody effector functions.
  • 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15 amino acid substitutions may be made for example to the heavy or the light chain of the anti-CD38 antibody.
  • any native residue in the heavy or light chain may also be substituted with alanine, as has been previously described for alanine scanning mutagenesis ( MacLennan et al., Acta Physiol Scand Suppl 643:55-67, 1998 ; Sasaki et al., Adv Biophys 35:1-24, 1998 ). Desired amino acid substitutions may be determined by those skilled in the art at the time such substitutions are desired. Amino acid substitutions may be done for example by PCR mutagenesis ( U.S. Pat. No. 4,683,195 ).
  • variants may be generated using well known methods, for example using random (NNK) or non-random codons, for example DVK codons, which encode 11 amino acids (Ala, Cys, Asp, Glu, Gly, Lys, Asn, Arg, Ser, Tyr, Trp) and screening the libraries for variants with desired properties.
  • the generated variants may be tested for their binding to CD38, their ability to induce ADCC, ADCP or apoptosis, or modulate CD38 enzymatic activity in vitro using methods described herein.
  • the anti-CD38 antibody can bind human CD38 with a range of affinities (K D ).
  • K D affinities
  • the anti-CD38 antibody binds to CD38 with high affinity, for example, with a K D equal to or less than about 10 -7 M, such as but not limited to, 1-9.9 (or any range or value therein, such as 1, 2, 3, 4, 5, 6, 7, 8, or 9) X 10 -8 , 10 -9 , 10 -10 , 10 -11 , 10 -12 , 10 -13 , 10 -14 , 10 -15 or any range or value therein, as determined by surface plasmon resonance or the Kinexa method, as practiced by those of skill in the art.
  • One exemplary affinity is equal to or less than 1 ⁇ 10 -8 M.
  • Another exemplary affinity is equal to or less than 1 ⁇ 10 -9 M.
  • the anti-CD38 antibody is a bispecific antibody.
  • the VL and/or the VH regions of the existing anti-CD38 antibodies or the VL and VH regions identified de novo as described above may be engineered into bispecific full length antibodies.
  • Such bispecific antibodies may be made by modulating the CH3 interactions between the monospecific antibody heavy chains to form bispecific antibodies using technologies such as those described in U.S. Pat. No. 7,695,936 ; Int. Pat. Publ. No. WO04/111233 ; U.S. Pat. Publ. No. US2010/0015133 ; U.S. Pat. Publ. No. US2007/0287170 ; Int. Pat.
  • WO2009/134776 or structures that include various dimerization domains to connect the two antibody arms with different specificity, such as leucine zipper or collagen dimerization domains (Int. Pat. Publ. No. WO2012/022811 , U.S. Pat. No. 5,932,448 ; U.S. Pat. No. 6,833,441 ).
  • the anti-CD38 antibody is conjugated to a toxin. Conjugation methods and suitable toxins are well known.
  • the ALL is B-cell lineage ALL.
  • the ALL is T-cell lineage ALL.
  • the ALL is adult ALL.
  • the ALL is pediatric ALL.
  • the anti-CD38 antibody is administered as a remission induction or as a postinduction therapy.
  • the ALL is refractory or relapsed ALL.
  • the subject has a white blood cell count of at least about 1 ⁇ 10 9 /L.
  • the ALL cells have a Philadelphia chromosome.
  • “Philadelphia chromosome” or “Ph” refers to a well-known chromosomal translocation between chromosomes 9 and 22, resulting in the oncogenic BCR-ABL gene fusion with constitutively active tyrosine kinase activity. The translocation results in a portion of the BCR gene from chromosome 22q11 becoming fused with a portion of the ABL gene from chromosome 9q34, and is designated as t(9;22)(q34;q11) under the International System for Human Cytogenetic Nomenclature (ISCN). Depending on the precise location of the fusion, the molecular weight of the resulting fusion protein can range from 185 to 210 kDa. “Philadelphia chromosome” refers to all BCR-ABL fusion proteins formed due the (9;22)(q34;q11) translocation.
  • Ph chromosome is present in about 20% of adults with ALL and a small percentage of children with ALL and is associated with poor prognosis.
  • patients with Ph+ positive ALL may be on tyrosine kinase inhibitor (TKI) regimen and may have therefore become resistant to the TKI.
  • TKI tyrosine kinase inhibitor
  • the anti-CD38 antibodies may thus be administered to a subject who has become resistant to selective or partially selective BCR-ABL inhibitors.
  • Exemplary BCR-ABL inhibitors are for example imatinib, dasatinib, nilotinib, bosutinib, ponatinib, bafetinib, saracatinib, tozasertib, danusertib or ibrutinib.
  • chromosomal rearrangements identified in B-lineage ALL patients are t(v;11q23) (MLL rearranged), t(1;19)(q23;p13.3); TCF3-PBX1 (E2A-PBX1), t(12;21)(p13;q22); ETV6-RUNX1 (TEL-AML1) and t(5;14)(q31;q32); IL3-IGH.
  • the subject has ALL with t(v;11q23) (MLL rearranged), t(1;19)(q23;p13.3); TCF3-PBX1 (E2A-PBX1), t(12;21)(p13;q22); ETV6-RUNX1 (TEL-AML1) ort(5;14)(q31;q32); IL3-IGH chromosomal rearrangement.
  • Chromosomal rearrangements can be identified using well known methods, for example fluorescent in situ hybridization, karyotyping, pulsed field gel electrophoresis, or sequencing.
  • the subject is resistant or has acquired resistance to treatment with at least one BCR-ABL kinase inhibitor.
  • the at least one BCR-ABL kinase inhibitor is imatinib, dasatinib, nilotinib, bosutinib, ponatinib, bafetinib, saracatinib, tozasertib, danusertib or ibrutinib.
  • Various qualitative and/or quantitative methods may be used to determine if a subject is resistant, has developed or is susceptible to developing a resistance to treatment with at least one BCR-ABL kinase inhibitor.
  • Symptoms that may be associated with resistance include, for example, a decline or plateau of the well-being of the patient, an increase in the size of a tumor, increase in the number of cancer cells, arrested or slowed decline in growth of a tumor or tumor cells, and/or the spread of cancerous cells in the body from one location to other organs, tissues or cells.
  • Re-establishment or worsening of various symptoms associated with tumor may also be an indication that a subject has developed or is susceptible to developing resistance to at least one BCR-ABL kinase inhibitor.
  • the symptoms associated with cancer may vary according to the type of cancer.
  • symptoms associated with ALL may include swollen lymph nodes in neck, groin or armpits, fever, night sweats, coughing, chest paint, unexplained weight loss, abdominal swelling or pain, or a feeling of fullness.
  • Other means to determine if a subject has developed a resistance to at least one BCR-ABL kinase inhibitor include analyses of tumor burden in a patient with ALL.
  • the anti-CD38 antibody is administered in combination with vincristine.
  • the subject has received or will receive radiotherapy.
  • the subject has received or will receive a bone marrow transplant.
  • the subject having ALL is homozygous for phenylalanine at position 158 of CD16 (FcyRIIIa-158F/F genotype) or heterozygous for valine and pheynylalanine at position 158 of CD 16 (FcyRIIIa-158F/V genotype).
  • CD16 is also known as the Fc gamma receptor IIIa (FcyRIIIa) or the low affinity immunoglobulin gamma Fc region receptor III-A isoform.
  • Valine/phenylalanine (V/F) polymorphism at FcyRIIIa protein residue position 158 has been shown to affect FcyRIIIa affinity to human IgG.
  • Receptor with FcyRIIIa-158F/F or Fc ⁇ RIIIa-158F/V polymorphisms demonstrates reduced Fc engagement and therefore reduced ADCC when compared to the Fc ⁇ RIIIa-158V/V.
  • the lack of or low amount of fucose on human N-linked oligosaccharides improves the ability of the antibodies to induce ADCC due to improved binding of the antibodies to human FcyRIIIa (CD16) ( Shields et al., J Biol Chem 277:26733-40, 2002 ).
  • Patients can be analyzed for their FcyRIIIa polymorphism using routine methods.
  • the invention also provides for the method of treating a subject having ALL, comprising administering to a patient in need thereof an anti-CD38 antibody that binds to the region SKRNIQFSCKNIYR (SEQ ID NO: 2) and the region EKVQTLEAWVIHGG (SEQ ID NO: 3) of human CD38 (SEQ ID NO: 1), wherein the anti-CD38 antibody induces in vitro killing of CD38-expressing cells by antibody-dependent cell-mediated cytotoxicity (ADCC), antibody-dependent cellular phagocytosis (ADCP), complement dependent cytotoxicity (CDC), apoptosis, or in vitro modulation of CD38 enzymatic activity, wherein the subject is homozygous for phenylalanine at position 158 of CD 16 or heterozygous for valine and pheynylalanine at position 158 of CD 16.
  • ADCC antibody-dependent cell-mediated cytotoxicity
  • ADCP antibody-dependent cellular phagocytosis
  • CDC complement dependent cytotoxicity
  • the invention also provides for the method of treating a subject having ALL, comprising administering to a patient in need thereof an anti-CD38 antibody that competes for binding to CD38 with an antibody comprising a heavy chain variable region (VH) of SEQ ID NO: 4 and a light chain variable region (VL) of SEQ ID NO: 5, wherein the anti-CD38 antibody induces in vitro killing of ALL cells by antibody-dependent cell-mediated cytotoxicity (ADCC), antibody-dependent cellular phagocytosis (ADCP), complement dependent cytotoxicity (CDC), apoptosis, or in vitro modulation of CD38 enzymatic activity, wherein the subject is homozygous for phenylalanine at position 158 of CD 16 or heterozygous for valine and pheynylalanine at position 158 of CD 16.
  • ADCC antibody-dependent cell-mediated cytotoxicity
  • ADCP antibody-dependent cellular phagocytosis
  • CDC complement dependent cytotoxicity
  • apoptosis or in vitro modulation
  • the anti-CD38 antibodies may be provided in suitable pharmaceutical compositions comprising the anti-CD38 antibody and a pharmaceutically acceptable carrier.
  • the carrier may be diluent, adjuvant, excipient, or vehicle with which the anti-CD38 antibody is administered.
  • vehicles may be liquids, such as water and oils, including those of petroleum, animal, vegetable or synthetic origin, such as peanut oil, soybean oil, mineral oil, sesame oil and the like.
  • 0.4% saline and 0.3% glycine can be used.
  • These solutions are sterile and generally free of particulate matter. They may be sterilized by conventional, well-known sterilization techniques (e.g.
  • compositions may contain pharmaceutically acceptable auxiliary substances as required to approximate physiological conditions such as pH adjusting and buffering agents, stabilizing, thickening, lubricating and coloring agents, etc.
  • concentration of the molecules or antibodies of the invention in such pharmaceutical formulation may vary widely, i.e. , from less than about 0.5%, usually to at least about 1% to as much as 15 or 20% by weight and will be selected primarily based on required dose, fluid volumes, viscosities, etc., according to the particular mode of administration selected.
  • Suitable vehicles and formulations, inclusive of other human proteins, e.g., human serum albumin are described, for example, in e.g. Remington: The Science and Practice of Pharmacy, 21st Edition, Troy, D.B. ed., Lipincott Williams and Wilkins, Philadelphia, PA 2006, Part 5, Pharmaceutical Manufacturing pp 691-1092 , see especially pp. 958-989.
  • the mode of administration of the anti-CD38 antibody in the methods of the invention described herein, and in some embodiments of each and every one of the numbered embodiments listed below, may be any suitable route such as parenteral administration, e.g., intradermal, intramuscular, intraperitoneal, intravenous or subcutaneous, pulmonary, transmucosal (oral, intranasal, intravaginal, rectal) or other means appreciated by the skilled artisan, as well known in the art.
  • parenteral administration e.g., intradermal, intramuscular, intraperitoneal, intravenous or subcutaneous, pulmonary, transmucosal (oral, intranasal, intravaginal, rectal) or other means appreciated by the skilled artisan, as well known in the art.
  • the anti-CD38 antibody in the methods of the invention described herein, and in some embodiments of each and every one of the numbered embodiments listed below, may be administered to a patient by any suitable route, for example parentally by intravenous (i.v.) infusion or bolus injection, intramuscularly or subcutaneously or intraperitoneally.
  • i.v. infusion may be given over for example 15, 30, 60, 90, 120, 180, or 240 minutes, or from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12 hours.
  • the dose given to a patient having ALL is sufficient to alleviate or at least partially arrest the disease being treated ("therapeutically effective amount") and may be sometimes 0.005 mg to about 100 mg/kg, e.g. about 0.05 mg to about 30 mg/kg or about 5 mg to about 25 mg/kg, or about 4 mg/kg, about 8 mg/kg, about 16 mg/kg or about 24 mg/kg , or for example about 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 mg/kg, but may even higher, for example about 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 30, 40, 50, 60, 70, 80, 90 or 100 mg/kg.
  • a fixed unit dose may also be given, for example, 50, 100, 200, 500 or 1000 mg, or the dose may be based on the patient's surface area, e.g., 500, 400, 300, 250, 200, or 100 mg/m 2 .
  • 1 and 8 doses e.g., 1, 2, 3, 4, 5, 6, 7 or 8
  • the administration of the anti-CD38 antibody in the methods of the invention described herein, and in some embodiments of each and every one of the numbered embodiments listed below, may be repeated after one day, two days, three days, four days, five days, six days, one week, two weeks, three weeks, one month, five weeks, six weeks, seven weeks, two months, three months, four months, five months, six months or longer. Repeated courses of treatment are also possible, as is chronic administration. The repeated administration may be at the same dose or at a different dose.
  • the anti-CD38 antibody in the methods of the invention may be administered at 8 mg/kg or at 16 mg/kg at weekly interval for 8 weeks, followed by administration at 8 mg/kg or at 16 mg/kg every two weeks for an additional 16 weeks, followed by administration at 8 mg/kg or at 16 mg/kg every four weeks by intravenous infusion.
  • the anti-CD38 antibodies may be administered in the methods of the invention described herein, and in some embodiments of each and every one of the numbered embodiments listed below, by maintenance therapy, such as, e.g ., once a week for a period of 6 months or more.
  • anti-CD38 antibodies in the methods of the invention described herein, and in some embodiments of each and every one of the numbered embodiments listed below, may be provided as a daily dosage in an amount of about 0.1-100 mg/kg, such as 0.5, 0.9, 1.0, 1.1, 1.5, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 40, 45, 50, 60, 70, 80, 90 or 100 mg/kg, per day, on at least one of day 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, or 40, or alternatively, at least one of week 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 after initiation of treatment, or any combination thereof, using single or divided doses of every 24, 12, 8, 6, 4, or 2 hours, or any combination thereof.
  • Anti-CD38 antibodies in the methods of the invention described herein, and in some embodiments of each and every one of the numbered embodiments listed below, may also be administered prophylactically in order to reduce the risk of developing cancer, delay the onset of the occurrence of an event in cancer progression, and/or reduce the risk of recurrence when a cancer is in remission. This may be especially useful in patients wherein it is difficult to locate a tumor that is known to be present due to other biological factors.
  • the anti-CD38 antibody in the methods of the invention described herein, and in some embodiments of each and every one of the numbered embodiments listed below, may be lyophilized for storage and reconstituted in a suitable carrier prior to use. This technique has been shown to be effective with conventional protein preparations and well known lyophilization and reconstitution techniques can be employed.
  • anti-CD38 antibody in the methods of the invention described herein, and in some embodiments of each and every one of the numbered embodiments listed below, may be administered in combination with vincristine.
  • Vincristine may be administered for example at about 0.1 to 2 mg/kg single dose i.p., for example 0.1 to 0.5 mg/kg single dose i.p, for example 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2.0 mg/kg.
  • Vincristine may be given as i.v. infusion.
  • the combination of the anti-CD38 antibody and vincristine may be administered over any convenient timeframe.
  • the anti-CD38 antibody and vincristine may be administered to a patient on the same day, and even in the same intravenous infusion.
  • the anti-CD38 antibody and vincristine may also be administered on alternating days or alternating weeks or months, and so on.
  • the anti-CD38 antibody and vincristine may be administered with sufficient proximity in time that they are simultaneously present (e.g., in the serum) at detectable levels in the patient being treated.
  • an entire course of treatment with the anti-CD38 antibody consisting of a number of doses over a time period is followed or preceded by a course of treatment with vincristine, consisting of a number of doses.
  • a recovery period of 1, 2 or several days or weeks may be used between administration of the anti-CD38 antibody and vincristine.
  • Anti-CD38 antibody or a combination of anti-CD38 antibody and vincristine may be administered together with any form of radiation therapy including external beam radiation, intensity modulated radiation therapy (IMRT) and any form of radiosurgery including Gamma Knife, Cyberknife, Linac, and interstitial radiation (e.g. implanted radioactive seeds, GliaSite balloon), and/or with surgery.
  • IMRT intensity modulated radiation therapy
  • radiosurgery including Gamma Knife, Cyberknife, Linac, and interstitial radiation (e.g. implanted radioactive seeds, GliaSite balloon), and/or with surgery.
  • ALL 7015 model Tumor was resected from a 17 year old female having B cell lineage ALL.
  • White blood cell count (WBC) was 98 ⁇ 10 9 /L, hemoglobin (HB) 101g/L and platelet count (plt) 24 ⁇ 10 9 /L.
  • Philadelphia chromosome was evident in tumor cells with rearrangement BCR/ABL-P210 (t9;22)(q34:q11).
  • Tumor cells were negative for following rearrangements: TEL/AML1, E2A/PBX1, MLL related gene, SIL/TAL1, IgH.
  • Ratio of expression of Wilm's tumor 1 gene (WT1) to ABL gene (WT1/ABL) was 1.2%.
  • Grade 1 hyperplasia with 95% of primitive lymphocytes was evident in bone marrow. 92.8% of abnormal bone marrow cells expressed CD38.
  • ALL 7473 model Tumor was resected from a 35 year old make having T cell lineage ALL.
  • WBC was 7.4 ⁇ 10 9 /L, HB 112 g/L, and pit 73 ⁇ 10 9 /L.
  • Tumor cells were negative for following chromosomal rearrangement: BCR/ABL.
  • SIL/TAL MLL related gene, TCR ⁇ .
  • WT1/ABL was 2.0%.
  • Grade I-II hyperplasia with 86% of primitive lymphocytes was evident in the bone marrow. 78% of abnormal cells expressed CD38.
  • NOD/SCID female, 3-4 weeks old were inoculated with 2 ⁇ 10 6 of ALL-7015 or ALL-7473 frozen cells. The animals were evaluated every 3-4 days for the appearance of tumor cells in the peripheral blood. Treatment was initiated when the tumor burden in the blood reached a specified level (ALL 7015: ⁇ 4.2% and ALL 7473: ⁇ 0.5%). The Tumor Burden (TB) was measured once a week by flow cytometry and measured as percentage of CD45 + CD38 + cells in peripheral blood obtained from retro-orbital bleed. The animals were also monitored daily for morbidity and mortality. Death and observed clinical signs are recorded on the basis of the numbers of animals within each subset.
  • Figure 1 shows the efficacy of daratumumab in the ALL 7015 model and Figure 2 shows the efficacy of daratumumab in the ALL 7473 model.
  • Table 1 shows the tumor burden at different time points in the ALL 7015 model. Treatment with daratumumab at 10 mg/kg resulted in significant tumor growth inhibition at Day 29, Day36 and Day43 when compared to mice treated with isotype control.
  • Table 1. Days ALL-7015: Tumor Burden (TB) (% of human CD45 + cell population) Statistic Results Isotype (10mg/kg) Daratumumab (10mg/kg) Isotype vs.
  • Table 2 shows the tumor burden at different time points in the ALL 7015 model. Treatment of mice with daratumumab showed significant tumor growth inhibition compared to mice treated with a control antibody. Table 2. Days ALL-7473: Tumor Burden (TB) (% of human CD45 + cell population) Statistic Results Isotype Daratumumab (10mg/kg) Isotype vs. Daratumumab (10mg/kg) n TB n TB P Value D22 (Grouping) 10 0.5 ⁇ 0.1 10 0.7 ⁇ 0.3 P>0.05 D29 10 13.7 ⁇ 3.9 10 4.8 ⁇ 0.7 P ⁇ 0.05 D36 6 - 7 - - D43 1 - 1 - - -
  • CB17 SCID mice were inoculated intravenously via the tail vein with the cell line NALM-6 tumor cells at 1 ⁇ 10 5 in 100 ⁇ L PBS for tumor development.
  • the date of tumor cell inoculation is denoted as Day 0.
  • Animals were divided in four treatment groups and were administered daratumumab, vincristine, or daratumumab in combination with vincristine at dosages as described in Table 3.
  • NALM-6 cell line (ACC128, DZMZ) is established from the peripheral blood of a 10-year old man with ALL in relapse.
  • Karyotype of the cell line is 46(43-47) ⁇ 2n>XY, t(5;12)(q33.2;p13.2). Table 3.
  • Groups n a Treatment Dose (mg/kg) Dosing Route b Schedule c Till the end of the study 1 12 Vehicle (IgG) 10 i.p. QW 2 12 Daratumumab 10 i.p. QW 3 12 Vincristine 0.5 i.v. QW 4 12 Daratumumab + Vincristine 10+0.5 i.p. + i.v. QW + QW a: n, animal number; i.p. : intraperitoneal injection; i.v .: intravenous injection; QW: once a week;
  • Endpoint The major endpoint was animal survival. Each mouse was evaluated daily and mice that showed deteriorating and moribund condition (animals have lost significant body mass: body weight lost > 20%) and animals that could not get to adequate food or water were euthanized with CO 2 . The survival of all animals was followed and median survival time (MST) was calculated for each group. Body weights were measured twice per week. The surviving mice after a maximum of twice the median survival of the vehicle group were sacrificed. In addition, autopsy was performed at the termination to confirm the tumor progression.
  • MST median survival time
  • mice with daratumumab either alone (as monotherapy) or in combination with the standard of care (vincristine) showed significant prolongation of survival compared to mice treated with control or vincristine alone ( Figure3 ).
  • the invention further provides the following numbered embodiments.

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